Version 1, March 2022
Operation Manual
For Hand Held Refractometer
Prism
Cover plate
Calibration screw
Rubber grip
Eyepiece with focus adjustment
Features
1. Easy to focus and calibrate.
2. High quality body construction.
3. Uses ambient light only which means battery or power source is not required.
4. Cushioned with soft & comfortable non-slip rubber.
5. With ATC function (ATC Compensation Range: 10°C~30°C (50°F~86°F)).
6. Durable and built to last long.
Calibration Procedure
1. Begin the calibration of your refractometer by lifting up the cover plate and placing
2-3 drops of distilled water on top of the prism assembly. Close the cover plate so
the water spreads across the entire surface of the prism without any air bubbles or
dry spots.
2. Hold the refractometer in the direction of a natural light source and look into the
eyepiece. You will see a circular field with graduations down the center. You may
have to focus the eyepiece to clearly see the graduations.
3. Remove cap from adjustment screw, adjust the line between blue (top) and white
(bottom) until the dividing line is even with the zero line at the bottom of the scale.
4. Replace protective cap on adjustment screw.
Usage Instructions
1. Hold refractometer in the direction of a light source, look into the eyepiece and
focus the eyepiece to see the graduations clearly.
2. Open cover plate, clean the instrument using a soft, damp cloth.
3. Place 2-3 drops of sample water on the main prism, close the cover plate and
press gently so that it spreads across the entire surface of the prism without air
bubbles.
4. Hold device horizontally in the direction of a light source. Look into the eyepiece
